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Date: Mon, 6 Dec 2021 07:04:12 -0800
From: Bjorn Andersson <bjorn.andersson@...aro.org>
To: Robert Foss <robert.foss@...aro.org>
Cc: agross@...nel.org, todor.too@...il.com, mchehab@...nel.org,
robh+dt@...nel.org, angelogioacchino.delregno@...ainline.org,
linux-arm-msm@...r.kernel.org, linux-media@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
Andrey Konovalov <andrey.konovalov@...aro.org>,
Stephan Gerhold <stephan@...hold.net>
Subject: Re: [PATCH v3 1/4] media: camss: csiphy: Move to hardcode CSI Clock
Lane number
On Thu 18 Nov 04:48 PST 2021, Robert Foss wrote:
> QCOM ISPs do not support having a programmable CSI Clock Lane number.
>
> In order to accurately reflect this, the different CSIPHY HW versions
> need to have their own register layer for computing lane masks.
>
> Signed-off-by: Robert Foss <robert.foss@...aro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Regards,
Bjorn
> ---
> .../qcom/camss/camss-csiphy-2ph-1-0.c | 19 +++++++++++++++--
> .../qcom/camss/camss-csiphy-3ph-1-0.c | 17 ++++++++++++++-
> .../media/platform/qcom/camss/camss-csiphy.c | 21 +------------------
> .../media/platform/qcom/camss/camss-csiphy.h | 7 +++++++
> 4 files changed, 41 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c b/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c
> index 30b454c369ab..cd4a8c369234 100644
> --- a/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c
> +++ b/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c
> @@ -16,6 +16,7 @@
>
> #define CAMSS_CSI_PHY_LNn_CFG2(n) (0x004 + 0x40 * (n))
> #define CAMSS_CSI_PHY_LNn_CFG3(n) (0x008 + 0x40 * (n))
> +#define CAMSS_CSI_PHY_LN_CLK 1
> #define CAMSS_CSI_PHY_GLBL_RESET 0x140
> #define CAMSS_CSI_PHY_GLBL_PWR_CFG 0x144
> #define CAMSS_CSI_PHY_GLBL_IRQ_CMD 0x164
> @@ -26,6 +27,19 @@
> #define CAMSS_CSI_PHY_GLBL_T_INIT_CFG0 0x1ec
> #define CAMSS_CSI_PHY_T_WAKEUP_CFG0 0x1f4
>
> +static u8 csiphy_get_lane_mask(struct csiphy_lanes_cfg *lane_cfg)
> +{
> + u8 lane_mask;
> + int i;
> +
> + lane_mask = 1 << CAMSS_CSI_PHY_LN_CLK;
> +
> + for (i = 0; i < lane_cfg->num_data; i++)
> + lane_mask |= 1 << lane_cfg->data[i].pos;
> +
> + return lane_mask;
> +}
> +
> static void csiphy_hw_version_read(struct csiphy_device *csiphy,
> struct device *dev)
> {
> @@ -105,7 +119,7 @@ static void csiphy_lanes_enable(struct csiphy_device *csiphy,
>
> for (i = 0; i <= c->num_data; i++) {
> if (i == c->num_data)
> - l = c->clk.pos;
> + l = CAMSS_CSI_PHY_LN_CLK;
> else
> l = c->data[i].pos;
>
> @@ -129,7 +143,7 @@ static void csiphy_lanes_disable(struct csiphy_device *csiphy,
>
> for (i = 0; i <= c->num_data; i++) {
> if (i == c->num_data)
> - l = c->clk.pos;
> + l = CAMSS_CSI_PHY_LN_CLK;
> else
> l = c->data[i].pos;
>
> @@ -167,6 +181,7 @@ static irqreturn_t csiphy_isr(int irq, void *dev)
> }
>
> const struct csiphy_hw_ops csiphy_ops_2ph_1_0 = {
> + .get_lane_mask = csiphy_get_lane_mask,
> .hw_version_read = csiphy_hw_version_read,
> .reset = csiphy_reset,
> .lanes_enable = csiphy_lanes_enable,
> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c
> index e318c822ab04..cde6b3a10b9e 100644
> --- a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c
> +++ b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c
> @@ -43,6 +43,7 @@
> #define CSIPHY_3PH_LNn_CSI_LANE_CTRL15_SWI_SOT_SYMBOL 0xb8
>
> #define CSIPHY_3PH_CMN_CSI_COMMON_CTRLn(n) (0x800 + 0x4 * (n))
> +#define CSIPHY_3PH_CMN_CSI_COMMON_CTRL5_CLK_ENABLE BIT(7)
> #define CSIPHY_3PH_CMN_CSI_COMMON_CTRL6_COMMON_PWRDN_B BIT(0)
> #define CSIPHY_3PH_CMN_CSI_COMMON_CTRL6_SHOW_REV_ID BIT(1)
> #define CSIPHY_3PH_CMN_CSI_COMMON_STATUSn(n) (0x8b0 + 0x4 * (n))
> @@ -320,6 +321,19 @@ static void csiphy_gen2_config_lanes(struct csiphy_device *csiphy,
> }
> }
>
> +static u8 csiphy_get_lane_mask(struct csiphy_lanes_cfg *lane_cfg)
> +{
> + u8 lane_mask;
> + int i;
> +
> + lane_mask = CSIPHY_3PH_CMN_CSI_COMMON_CTRL5_CLK_ENABLE;
> +
> + for (i = 0; i < lane_cfg->num_data; i++)
> + lane_mask |= 1 << lane_cfg->data[i].pos;
> +
> + return lane_mask;
> +}
> +
> static void csiphy_lanes_enable(struct csiphy_device *csiphy,
> struct csiphy_config *cfg,
> s64 link_freq, u8 lane_mask)
> @@ -331,7 +345,7 @@ static void csiphy_lanes_enable(struct csiphy_device *csiphy,
>
> settle_cnt = csiphy_settle_cnt_calc(link_freq, csiphy->timer_clk_rate);
>
> - val = BIT(c->clk.pos);
> + val = CSIPHY_3PH_CMN_CSI_COMMON_CTRL5_CLK_ENABLE;
> for (i = 0; i < c->num_data; i++)
> val |= BIT(c->data[i].pos * 2);
>
> @@ -397,6 +411,7 @@ static void csiphy_lanes_disable(struct csiphy_device *csiphy,
> }
>
> const struct csiphy_hw_ops csiphy_ops_3ph_1_0 = {
> + .get_lane_mask = csiphy_get_lane_mask,
> .hw_version_read = csiphy_hw_version_read,
> .reset = csiphy_reset,
> .lanes_enable = csiphy_lanes_enable,
> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.c b/drivers/media/platform/qcom/camss/camss-csiphy.c
> index 24eec16197e7..ac7e96e6b7cd 100644
> --- a/drivers/media/platform/qcom/camss/camss-csiphy.c
> +++ b/drivers/media/platform/qcom/camss/camss-csiphy.c
> @@ -229,25 +229,6 @@ static int csiphy_set_power(struct v4l2_subdev *sd, int on)
> return 0;
> }
>
> -/*
> - * csiphy_get_lane_mask - Calculate CSI2 lane mask configuration parameter
> - * @lane_cfg - CSI2 lane configuration
> - *
> - * Return lane mask
> - */
> -static u8 csiphy_get_lane_mask(struct csiphy_lanes_cfg *lane_cfg)
> -{
> - u8 lane_mask;
> - int i;
> -
> - lane_mask = 1 << lane_cfg->clk.pos;
> -
> - for (i = 0; i < lane_cfg->num_data; i++)
> - lane_mask |= 1 << lane_cfg->data[i].pos;
> -
> - return lane_mask;
> -}
> -
> /*
> * csiphy_stream_on - Enable streaming on CSIPHY module
> * @csiphy: CSIPHY device
> @@ -261,7 +242,7 @@ static int csiphy_stream_on(struct csiphy_device *csiphy)
> {
> struct csiphy_config *cfg = &csiphy->cfg;
> s64 link_freq;
> - u8 lane_mask = csiphy_get_lane_mask(&cfg->csi2->lane_cfg);
> + u8 lane_mask = csiphy->ops->get_lane_mask(&cfg->csi2->lane_cfg);
> u8 bpp = csiphy_get_bpp(csiphy->formats, csiphy->nformats,
> csiphy->fmt[MSM_CSIPHY_PAD_SINK].code);
> u8 num_lanes = csiphy->cfg.csi2->lane_cfg.num_data;
> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.h b/drivers/media/platform/qcom/camss/camss-csiphy.h
> index d71b8bc6ec00..1c14947f92d3 100644
> --- a/drivers/media/platform/qcom/camss/camss-csiphy.h
> +++ b/drivers/media/platform/qcom/camss/camss-csiphy.h
> @@ -45,6 +45,13 @@ struct csiphy_config {
> struct csiphy_device;
>
> struct csiphy_hw_ops {
> + /*
> + * csiphy_get_lane_mask - Calculate CSI2 lane mask configuration parameter
> + * @lane_cfg - CSI2 lane configuration
> + *
> + * Return lane mask
> + */
> + u8 (*get_lane_mask)(struct csiphy_lanes_cfg *lane_cfg);
> void (*hw_version_read)(struct csiphy_device *csiphy,
> struct device *dev);
> void (*reset)(struct csiphy_device *csiphy);
> --
> 2.32.0
>
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